Just as a further bit of info there is a potterton motorized Valve fitted with 2 lights on it one for hot water and the other for Central heating. When I switch the hot water on on the EP2002 the Hotwater light is lit and is bright. The central heating light is also on but not as bright but it does become brighter if I move the lever from Auto to manual. The pump is still running as well ...
Steve M
May 2013
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